mmc: sdhci: add delay after the last tuning command

When host set the host->tuning_delay, even the last tuning
command need a delay, otherwise the first command after the
tuning will meet issue.

Take i.MX7D as an example, there will be the following log:
mmc2: switch to high-speed from hs200 failed, err:-110
mmc2: error -110 whilst initialising MMC card

Signed-off-by: Haibo Chen <[e-mail]>
Acked-by: Adrian Hunter <[e-mail]>
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/sdhci.c

···
 			return -ETIMEDOUT;
 		}
 
+		/* Spec does not require a delay between tuning cycles */
+		if (host->tuning_delay > 0)
+			mdelay(host->tuning_delay);
+
 		ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
 		if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) {
 			if (ctrl & SDHCI_CTRL_TUNED_CLK)
···
 			break;
 		}
 
-		/* Spec does not require a delay between tuning cycles */
-		if (host->tuning_delay > 0)
-			mdelay(host->tuning_delay);
 	}
 
 	pr_info("%s: Tuning failed, falling back to fixed sampling clock\n",